Chaos Orb ($1,142) An example of a dexterity card (a card that requires you to physically do something with it), Chaos Orb might be in shorter supply than other cards from the set, due to the reports of players tearing it into pieces to hit multiple creatures
But its still a precon deck, and there are always a few aspects which can be cleared up with a few extra singles at minimal cost and make it feel substantially more consistent at the tabletop
Once you have enough mana to cast Enduring Ideal, there's a high likelihood you can start running away with the game
Whether that was a needed mana boost is another question, but its a neat card
For example, Chandra's Ignition can have a white creature deal damage to a creature with protection from red
You cast the spell immediately as The Face of Boe's ability resolves